So i just rebuilt my top end on my 2005 kx250f. SS valves, pro-x stock piston and rings replacement, and an FMF powerbomb header and pipe other than that bike is stock. i pulled the carb apart and it had a pro-circuit jetting set-up so i went through and replaced all the jets back to stock except the pilot jet. Main jet 178 pilot is a 42 from a 40 OBEKS needle from clip position from top leak Jet is a 60 i also put in a moose racing adjustable air/fuel screw that is out 2 1/4 turns. when i am riding if i am at half throttle cruising at a single rpm the bike hiccups at a single rpm. Then when i snap the throttle open from half throttle it hesitates a second, hiccups then snaps open like a 2 stroke hittting a powerband. i thought i may have fouled a plug. so i pulled the old plug out and inspected it and it looked like it had been burning just fine. not rich or lean. so i put a new plug in it and the same thing happened. William1 i would like your opinion on this please. anyone else wanna chime in on what i should be looking for and tuning this thing out i'm all ears. Thanks.